Improvement in sewing-machine



HJ. HANCOCK.

Sewing Machine.

. No. 83,492. Patented ont. 27, 1868.

HENRY J. HANCQQK,

Meeres@ y cada g y OF NEW YORK, N. `Y.

. Latas Patent No. 83,492, daad october 27,1888.

IMPROVMENT IN SEWING-MACHINE.

The Schedule referred to in these Letters Patent `and making part of the same.

To all whom 'it 'ma/y conce/rn;

Beit known that I, HENRY J. HANCOCK, ofthe city,

county, and State of New York, have invented a new and useful Improvement in Sewing-Machines, of which the following is a full, clear, and exact description, referenceI being had to the accompanying drawing, forming part of this specification, and in whichl.Figure l represents a side elevation of a single-thread sewing-machine, constructedinaccordance with my improvement, and

Figure 2, a front view of the saine, the presser-foot and cloth-bed, or table, being in section in both views.

Similar letters of reference indicate corresponding parts.

My invention consists in a combination, in a needlefeed, of a needle-bar slide, workingbetween fixed inclined ways or guides, to produce the feed of the material, and presser-foot, capable of independent lift from the cloth, but reciprocating in direction of the feed, together with the needle-bar slide, from a rock-shaft, or rockingcentre, common ,to both, and operating, it may be, in connection with a suitable tension-device for taking up the slack, and controlling the run of the thread to Jehe needle.

Referrngto the accompanying drawing, A represents the cl tlg-bed, or table, B the main frame of the machine, carrying the needle-thread spool G, and main driving-shaft\ D, which, as it is rotated, serves, by an eccentric, E, rod a, and crank, or its equivalent, F, to give a reciprocating motion to a shaft, G, that carries on its forward end a -hoo'k, or looper, H, for catching the loop as it is brought down by the needle, and holding it for the passage of a subsequent loop through it, as in other single-thread machines. i

' The main driving-shaft D also serves to operate, through a crank or wrist-pin, b, from a disk, c, to give an up-andedown motion to a needle-bar slide, I, formed with ears or wings x x, which work within ixed guides.

or ways J J', that,in the up-and-down movements of the needle-bar, give the necessary reciprocating lateral movement to tlie needle d, and its appendages, to effect the feed of the cloth or other material across the table, and which vmay be regulated, according to the length of stitch required, by raising or lowering, through an adjustable-screw arrangement, the one xed incline J The table A has the usual oblong slot emade in o through it for play of the needle in effecting the feed, and the presser-foot K, which is connected with a bar,

j, has an aperture Ythrough it for passage of the needle in its up-and-down motion.

The bar f, of the presser-foot K, passes closely, but loosely, through the socketeportion of the needle-bar slide I, and through guides g g, that form projections from a bar or frame, L, which, by means ofva rockshaft, c', working in cylindrical bearing or socket, It,

wav-

connected with the main frame, serves as a common centre to both the needle-bar slide and presser-foot, to

admit ofthe lateral or swinging action of both devices in effecting the feed of the cloth, 'as accomplished by the up-and-down movement of the needle-bar slide, or its wings, x x, between the' stationary guides J J', with, however, every facility for independent lift ofthe presserfoot K, which is held down to its bearing on the cloth by a spring, l, that may be raised when it is required to raise the presser-foot from 'the cloth, by pulling lon a knob, m.

'Io prevent the cloth or material from slipping, or being drawn back by the presser-foot K, as the latter makes its return stroke in the lateral swing of it, to-

gether with the needle-bar slide, through the agency of the wings x x, and inclined guides J J", Ifurnish the cloth-bed or table Awith a serrated surface or surfaces,

n, situated below the presser-foot, and the serrations 4 or teeth of which arc of ratchet-form, orso shaped and arranged as that, in the lateral action of the needle and presser-foot, in eiecting the feed of the cloth, the latter will be at liberty to slip or slide over said serrated surfaces, a, while in the back movement of the presserfoot, after the needle has retired from the cloth, the serrations or teeth of the fixed surfaces n will, by their configuration and arrangement, hold the cloth from slipping or moving back with the presser-foot in its return movement. i l

The needle-thread o .passes from the spool C round an adjustable tension device, M, and from thence down through a spiral or coiled-wire spring, N, fastened at its lower end to the needle-bar slide, so as to reciprocate with the latter, said thread afterwards passing through a front' lower guide, c', projecting from the needle-bar, and from thence -through the eye of the needle. Such a spring-tension device, M, serves, in a most simple and eiiicient manner, to take up the slack of the thread in the' up-s`troke of the needle, and to induce a proper draught o`n the reel to keep up the supply.

P is a mirror secured to oneside of the frame, and

s s a clampingplate and-screw `for attaching the machine to a table or bench.

What is here claimed, and desired to be secured by The combination of the needle-bar slide I, with its wings :v x, inclined guides or ways J .J presser-foot K,

made capable of independent lift from the cloth, but 

